How many movies have Christine Baranski and Meryl Streep acted in together?

They have worked on 3 movies together! Their first movie together was Mamma Mia! (2008) while their highest rated movie together was Mamma Mia! Here We Go Again (2018). They have not worked together since Mamma Mia! Here We Go Again (2018). They are most known for their comedy films together.